You arrive at the same mysterious tunnel your friend had sent you a picture of a few hours ago. Alongside the picture was the caption, "I'm gonna have a look inside". You had, of course, told your friend to at least wait until you arrived, but there was no response. So, here you are now.

You look down at your phone, where a half-written message is waiting to be completed and sent: "I'm here,"

All you have to do now is write your friend's name onto the message, and then head inside...